Thread-cutting tool.



w.- w.1vo`sPER. THREAD CUTTING TOOL.

APPLICATION FILED J'UNE 2h 1,9151'.

Pat'nted Sept. 2,1, 1915.

M im@ L, 7

tool is intended.

WILLIAM W. VOSPER. OF TOLEDO, OHIO,

MACHINE COMPANY, OF TOLEDO,

ASSIGNOR TO THE TOLEDO PIPE THREADING OHIO, A CORPORATION OF OHIO.

THREAD-CUTTING TOOL.

vApplication filed June 21.

To a/Z P710/i1 it may concern.'

Be it known that l, lViLiiiAir 1V. Vosricn,

a citizen ofthe United States, and a resident of Toledo, in the county of Lucas and State of Ohio, have invented a certain new and useful Thread-Cutting Tool; and L do hereby declare the following to be a full, clear, and' exact description of the invention, such as will enable others skilled in the. art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the characters 'of reference marked thereon, which forma part of this specication.

This invention relates. to apparatus for cutting threads on pipes, rods or the like, and has for its object the provision of an improved tool of this character which is simple, strong, durable and inexpensive in its construction and which is small and compact in form to enable it to be used in corners or restricted spaces where tools of this class now in use cannot be employed.

A further important'feature of my invention is the provision of a tool of the character described which is capable of being easily and quickly engaged with or removed from an operating handle of the ratchet type to facilitate the use of thread cutting heads adapted for different sizes of work.

The invention is fully described in the following specification, and while, in its broader aspect, it is capable of embodiment in numerous forms, a preferred embodiment thereof is illustrated in the accompanying drawings, in which- F iO'ure 1 is a side' elevation of a tool embodying my invention. thereof. Fig. 3 is an enlarged central loigi-tudinal section Qn 'the line rv, in Figrf, y, y m

Fig. 2 is a face view Fig. 1..

Referring to the drawings, 1 designates the cutter head or die holder and is preferably of circular form with an axial circular opening 2 therein that is restricted at itsv inner end to form the internal shoulder 3. The head 1 is provided at its inner end with an integra-l tubular extension 4, the opening 5 of which axially registers with the head opening 2, but is restricted to an extent relativethereto t0 adapt it to have a turning fit on work of the size forWhich the articular The extension 4 1s smaller Specification of Letters Patent.

Patented Sept. 21, 1915. 1915. 'seriai No. 35,314.

than the head 1 and is intended to rotatably fit into the hub opening 6 of a straight handie?. This handle has tending axially therethrough outward from the hub opening G,

ger type, the tooth of which is disposed to project within the hub opening 6. The pawl 9 is normally urged inward by a coiled compression spring 10 that is disposed within the handle and confined between the paw! oscillation of the handle, as will be under` stood. It is evident by reference to Fig. 4 that the tooth of the pawl 9 engages and imparts a turning movement to the extension 1 in only one direction of oscillating movements of the handle 7.

The outer end of the hea'd l is provided, in the present instance, with four radially disposed equidistantly spaced recesses 15 in each of which a thread-cutting die 16 is mounted. The outer ends of the dies 16 are preferably flush with the outer side of the head 1 while the inner ends thereof project a distance within thel opening 2 which is greater than the amount of restriction of the extension opening 5 relative to said opening 2 and have their inner ends provided With thread cutting teeth. as is well understood in the art. VThe recesses 15 are of sufficient depth to extend a lshort distance lWithin the shoulder 3 so that the dies 1G, when seated y in the recesses, have their inner ends braced against lateral or cutting strains by the Walls of the recesses disposedwitliin the shoulder 3. This is found to be quite an essential feature, as a very considerable strainis applied to the innerends of the dies when a thread is being cut and there would be danger vof breaking off tne inner portions of the dies'ifl they were not braced against such lateral strain. It will be noted that while the dies are' braced in thismanner to near an opening 8 ex-v l D and mounted in the innerA end of this opening is a pawl 9 of the plunthe inner ends' thereof such bracing does 'not in any Way interfere With the cutting action, as the cutting takes place Within the large portion ofthe head opening 2.

The dies 16 are secured Within the recesses 15 by a collar 17, which conforms in size to the outer end of the head 1 and is secured tosuch end in holding outer edges of the dies by screws 18. rI`he dies 16 are of greater depth at their inner ends than the recesses 15 to adapt them to shoulder, as`V at 16, against the inner edge of the ring 17 whereby the outward thrust of the dies is resisted by said collar.

' It is evidentin the use of my improved tool that the extension l rotatably fits the Work to'be threaded so that the Work serves as a shaft about Which the tool is turned. It is also evident that the size of the tool opening may be'enlarg'ed or restricted to suit the size of thework operated on Without changing the external dimensions of the tool, thereby enabling tools adapted for different sizes of work to be used in connection with the same ratchet handle 7, it being only necessary to remove "one tool from such handle and 'to place another of the proper size in engagement therewit y. The bore 2 and the opening of the collar 17, which are preferably the same, are considerably larger than the diameter of the Work so that plenty of free space is provided around the Work at the point of cutting the contact with the thread to permit the cuttings to pass freely out ofthe die I carrying head thereby preventing clogging. The dies 16 may be either of the tapered` 0r straight thread cutting type. y

I Wish it understood that my invention is not limited to any specific construction, arrangement or form of the parts, except in so far as such limitations are specified 1n the 1 claim.

Having thus what I claim as new, and desire to secure by Letters Patent, is,- y In a tool' of the class described, a compact die head having a4 central opening which is restrictedv adjacent to the inner end of the head to forman internal shoulder, said head also having a coaxial tubular extension at its inner end and having its outer end prodescribed. i my invention,

vided with a plurality of radially disposed extend into saidv shoulder, said extension being restricted in cross-section relative to the head and having peripheral teeth to form a toothed journal to rotatably carry a ratchet handle,

recesses which portions shoulder,

the outer end of the head and c oacting with the dies to retain them in the recesses.

In testimony signed my name to WILLIAM W.

this specication.

voeren.

whereof, I have hereuntol diesmounted in i said recesses and braced attheir inner ends'4 -against lateral strains by the Walls. of the 

